Feed for lathes.



G. L. LIBBY.

FEED FOR LATHBS.

APPLICATION FILED FEB. 6, 1908.

939,043. Patented N0v.2, 1909.

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IN VEN TOR.

3 Charles L Limp? ATTORNEY.

mnnew. a. mumu co.. WOTO-LITMOGEAFNEI-Il WASKINGYON n. c.

0. L. LI BBY. FEED FOR LATHES.

APPLICATION FILED FEB. 6, 1908.

939,043. Patented Nov. 2, 1909.

3 SHEETS-SHEET 2.

WITNESSES. IN VENTORL WW1 MI C1 1 L.L '1) r 6 BY 13.11 (Z5 1 j AT EY.

ANDREW. B. GRAHAM cu. PHDYO-LIYNOGRAPNERS. WASMNGYQN, u. c.

G. L. LIBBY.

FEED FOR LATHES.

APPLIOATIONTILED FEB.6, 1908.

939,043. Patented N0v. 2,.1909.

3 $HEETS-SHEET 3.

WITNESSES: IN VEN TOR.

Wflf-W Ch 1 L.L'L1 21 By 2m- 28 1 y ATTORNEY.

moniw. a GRAHAM m, womumusmnnias WA 1 CHARLES L. LIBBY, OF INDIANAPOLIS,INDIANA.

FEED FOR LATHES.

Specification of Letters Patent.

Patented Nov. 2, 1909.

Application filed February 6, 1908. Serial No. 414,503.

To all whom it may concern:

Be it known that I, CHARLES L. LIBBY, of Indianapolis, county of Marion,and State of Indiana, have invented a certain new and useful Feed forLathes; and I do hereby declare that the following is a full, clear, andexact description thereof, reference being had to the accompanyingdrawings, in which like figures refer to like parts.

The object of this invention is to provide an improved feed mechanismfor lathes.

One feature of the invention consists in providing a system of planetarygears for transmitting power from a continuously operative driving shaftto means operative on a stationary lead screw that enables the feed tobe quickly stopped and the impetus of the carriage quietly checked, andalso be quickly and quietly reversed. To this end there is provided alarge constantly driven gear within which there is mounted a gear fordriving the feed mechanism on the lead screw and another gear which maybe stopped or released by the stop mechanism, and planetary gears fortransmitting power from the continuously rotating large gear to saidstop gear, and from the latter to the gear that operates the feedmechanism on the lead screw, whereby when the stop gear is stopped, thefeed mechanism will be oper-' ated, and when the stop gear is revolving,like an idler, the feed mechanism will not be operated. By reason ofthis construction, when the feed is released the pilot wheel rotates andby the operator holding on to the pilot wheel causes the feed to actwithout being mechanically connected. Also in taking heavy shaving cutsthe operator can release the pilot wheel, that is, let it slip throughhis fingers, and reduce his feed to any fineness that he wishes.

The full nature of this invention will be understood from theaccompanying drawings and the following description and claims.

In the drawin 's Figure 1 is a front elevation of a part of a turretlathe, parts being broken away. Fig. 2 is a vertical longitudinalsection of the planetary gear mechanism on the line 22 of Fig. 3. Fig. 3is a substantially vertical section transversely 3. Fig. 6 is a sectionon the line 66 of Fig. 3. Fig. 7 is a horizontal section on the line 77of Fig. 4. Fig. 8 is a horizontal section on the line 88 of Fig. 4.

There appears in the drawings a lathe bed 10 upon which the turret slide11 is mounted, said turret slide having an extension 12 at one end uponwhich the turret 13 is secured by the clamp ring 14. From one side ofthe turret slide an apron 15 depends.

The turret is fed or moved by the rotation of means carried by the apronthat meshes with the threads 011 the lead screw rod 30 mountedhorizontally to the side of the lathe in suitable bearings, such as 21.Upon said screw 20 a threaded sleeve 22 is mounted as shown in Fig. 4,said sleeve being revolubly mounted in the bearing 23 and carrying onone end thereof a bevel gear 24. Said threaded sleeve and bevel gear arerotated on the screw by bevel gear 25 and the shaft 26, which isrotatably mounted in the hub 27 of the gear 28, and said hub is mountedin the apron 15 and the bearing 23 extends inwardly from the apron 15.

The parts above described are driven from the feed shaft 30 mountedhorizontally at the side of the machine in suitable bearings, such as81. Said shaft has a spline 32 extending for the full length thereof anda bevel gear 33 is splined thereon as shown in Fig. 3, and it mesheswith the bevel gear 34 that is keyed to the shaft 35. Said shaft ismounted in the tumbler lever 36 and the tumbler lever is mounted in theapron 15. There is a pinion 37 on the shaft 35 between the tumbler lever36 and the cover 88.

As seen in Fig. 2, there are two pinions 40 and 41 mounted by suitablespindles on the tumbler lever, the pinion 41 being always in mesh withthe pinion 37 and at times in mesh with the large gear 28. Said pinion41 is always in mesh with the pinion 40 and the latter is in mesh attimes with the gear 28, as in Fig. 5, when the outer end of the tumblerlever is thrown downwardly from the position shown in Fig. 2, to theposition shown in Fig. 5 so that the pin 43 will engage the hole 44 atthe lower end of the plate 45, and when the lever is in this position,power is transmitted from the gear 37 to the gear 28 through both thegears 40 and 41, but when the tumbler lever is in the position shown inFig. 2, power is transmitted directly from the pinion 3'7 through pinion41 to gear 28. The purpose of this is to reverse the direction ofmovement of the gear 2 1.

The gear 28 is mounted as shown in Fig. i and is quite wide and hollow,having a front plate 45. that has a hub 46 having bearing in the cover38. The gear 28 has on two opposite sides, as shown in Fig. 2, segmentalframe. plates H, the width of which is shown in Fig. 4:, and as thereshown said plates 17 may be integral with the body of the gear 28, andupon said frame. plates a? the front plate 4L5 is secured. This makesthe. gear 28 as a whole hollow, the upper and lower por tions howeverbeing open, as shown in Fig. 2. Centrally located within the chamberthus formed there is a gear 50 on the outer end of the shaft 26. Thereis an independent gear 51 coaxial with the gear 50 and secured 011 theinner end of the shaft 52 that is mounted in the sleeve 16, see Figs. 4and 5. The gear 50 meshes with the two oppositely located gears 53mounted on spindles, 54 which are secured at their ends in the gear 28at the rear. and the plate 4.5 in front, said gears 53 appearing in Fig.2. The gear 51 meshes with the gears 57' that are likewise mounted uponthe spindles 54; and are secured to or are integral with the smallergears 53, see Figs. 3 and 5.

On the outer end of the shaft 52 a pilot Wheel 60 is secured. It isprovided with an annular recess in which a friction ring 62 is locatedin front of the flanged extension 64: in the cover 38, see Fig. 4. Saidring 62 is split as shown in Fig. 8 and is spread by the flat end 65which, is oscillated by the. stop lever 66. The ring 62 cannot rotateindependently of the flange 63 or extension 6% from the cover because ofthe spreading bar 65 from the lever 66 which is mounted stationary inthe extension 64.: from the cover, as shown in Fig. 4i. Therefore, whensaid ring is expanded, as shown in Fig. 8 by ac.- tuating the lever 66,it frictionally engages the pilot wheel and stops the rotation'of saidwheel as well as shaft 52 and gear 51 on the inner end thereof. WVhenthat occurs and the gear 51 is maintained stationary, the planetarygears will cause the revolution of the. gear 50 and, therefore, theactuation of the gear 24: on the screw 20, and thereby cause a feedingmovement. hand, when the stop lever 66- is actuated in the oppositedirection from what is shown in Fig. 8 and the spring 62 is relaxed, thepilot On the other wheel can then turn and likewise the gear 51 on theinner end of the shaft 52. When said gear 51 is free to move, no powerwill be transmitted from the large gear 28 to the gear 50 and thefeeding movement will cease.

Alternative means, of a more positive character, is provided forengaging the pilot wheel and, therefore, holding the gear 51 stationaryduring the feeding movement of the device. This is used when the tool isemployed for cutting screw threads. It C011. sists of a transverselyslidable rack bar 7 0 mounted in the lower portion of the extensionfromthe cover 38, as seen in Figs. 3 and 7, and in position to be moved intoand out of engagement with the; pilot wheel by the rod 71 which has onit longitudinally extending teeth to engage said rack bar, said rodbeing mounted 1n the lateral extension 72. The rod 71 is operated by thecrank 7 3 having a spring-pressed handle 7&1 adapted to engage a notch75 in the. cover 38- for holding the rack bar in its actuated position.This mechanism is in the nature of a timing device. For instance, if thegearing and mechanism have been so, arranged that with one revolution ofthe pilot wheel the mechanism will be fed one inch or any deti- A nitedistance or number of threads on the screw being cut, whenever themachine is run back by hand either one or any number of revolutions ofthe pilot wheel, the pilot wheel is stopped by the rack bar 70. In otherwords, that rack bar when held in an engaging position, will stop thepilot wheel at the end of one revolution orat the end of any number ofrevolutions, and when thus stop.-

ped the tool is in exactly the right place to.

,Vhat I claim as my invention and; desire to secure by Letters Patentis:

1 A carriage feed for lathes including a continuously revolving largedriving gear, means for reversing it, a driven pinion cen-.trallymounted in said driving gear, means actuated by said pinion formoving the carriage, a driving pinion also centrally mounted in saiddriving gear in juxtaposition with said driven pinion and differing indiameter therefrom, means for controlling the rotation of one of thesepinions, and a pair of means for reversing it, a driven pinion centrallymounted in said driving gear, means actuated by sald p nion for movingthe carriage, a driving pinion also centrally mount;-

. ed in said driving gear in juxtaposition with said driven pinion anddiffering in diameter therefrom, means for controlling the rotation ofone of these pinions, a pair of planetary Inwitness whereofilhavehereunto affixed gears carried by stud drlving gear and semy signature1n the presence of the Witnesses cured together and meshlng respectivelyhereln named.

with said pinion, a pilot Wheel mounted in CHARLES L. LIBBY. connectionWith the driving pinion so as to itnesses: rotate therewith, and meansfor frictionally OLIVE BREEDEN,

stopping said pilot Wheel. V. H. LOCKWOOD.

